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Liver microsomal 7-alkoxycoumarin O-dealkylase activities in rats were stimulated by the administration of large doses of 5-[(2-aminoacetamide)methyl]-1-[4-chloro-2-(o-chlorobenzoyl)phenyl ]-N, N-dimethyl-1 H-s-triazole-3-carboxamide hydrochloride dihydrate (450191-S), a new sleep inducer which is a 1H-1,2,4-triazolyl benzophenone derivative. To obtain the correlation between the stimulation or induction of hepatic enzymes and the plasma level of the metabolites of 450191-S, various amounts of 450191-S were administered orally to rats and the metabolites in plasma were determined by high performance liquid chromatography. Plasma concentration-time profiles for metabolites in rats showed the appearance of metabolites in plasma followed by their rapid disappearance from blood when the animals received non-inducing amounts of 450191-S. On the other hand, the profiles of metabolites in rats administered higher amounts of the drug showed very high plasma concentrations of metabolites, especially 8-chloro-6-(2-chlorophenyl)-N-methyl-4H-1,2,4-triazolo [1,5-a] [1,4]benzodiazepine-2-carboxamide (M-2) and 8-chloro-6-(2- chlorophenyl)-N-hydroxymethyl-4H-1,2,4-triazolo [1,5-a] [1,4]benzodiazepine-2-carboxamide (M-A), which were maintained for a long time with slow elimination. These results led to the conclusion that the induction of hepatic drug-metabolizing enzymes is closely correlated with the high plasma concentrations of metabolites and their prolonged existence in plasma.

Induction of rat liver microsomal drug-metabolizing enzymes by a new sleep inducer 450191-S and plasma levels of 450191-S-metabolites.